1、附图2-2 郑州市慧祥煤业有限公司通风网络图(2009.11)2.2测定方法与仪器仪表本次测定选择精密气压计测阻法。为提高测定精度,以精密气压计测阻法中两点同时测定法完成本次测定工作。所用的仪器仪表有: BJ-1型精密气压计 3台 DHM-2型通风干湿球温度计 2台 风表(高、中、低速) 3块 秒表 1块 皮尺 1个2.3测定数据的整理与计算测定前期收集整理的资料与数据主要包括:测点位置、测点编号、测点标高、巷道名称、巷道支护与断面形状、巷道长度及风机参数等。这些参数在井下测定前分别填写了表格与图纸。2.3.1井巷断面尺寸计算梯形: S = HB (2.1) U = 4.16 (2.2)半圆拱
2、: S = B(h+0.39B)= B(H-0.11B) (2.3) U = 2H+1.57B = 3.84 (2.4)三心拱: S = B(h+0.26B) (2.5) U = 4.10 (2.6) 式中:S 井巷断面积,m2; B 巷道宽度(梯形为平均宽),m; H 巷道高度,m; h 巷道拱基高,m; U 巷道周长,m。2.3.2空气密度计算 (2.7) 空气密度,kg/m3; P空气绝对静压,Pa; 空气相对湿度,%; Ps饱和水蒸气分压力,Pa; t空气温度,。2.3.3测点风速风量计算风表校正公式: V真 = aV表 + b (2.8) V真表测风速,m/s; V表表读数,m/s;
3、 a,b常数。实际采用风表代号及校正公式分别为:中速表 V真=0.940V表+0.060 m/s井巷实际风速: V实 = kV真 (2.9)V实实际风速,m/s; V真 表测风速,m/s; K 测风方法校正系数; (2.10) 式中:S 实测断面,m2; c 常数,正常取0.4,巷中有皮带时取0.8。井巷风量: Q = V实S (2.11) 式中:Q 井巷风量,m3/s; V实,S 同上。2.3.4测段位压差及矿井自然风压计算测段A-B的位压差计算: (2.12)hZ 两测点的位压差,Pa ; 两测点的标高,m ; 两测点的空气密度,kg/m3 ; g 重力加速度,取9.8m/s2。矿井自然风
4、压计算: HN = = (hZ) (2.13) HN 矿井自然风压,Pa ; hZ 同上 。2.3.5通风阻力计算两测点A-B间的通风阻力h阻AB为: h阻AB =hS +hZ +hV (2.14) h阻AB两测点A-B间的通风阻力,Pa; hS两测点A-B间的静压差,Pa; hS =PA- PB + (2.15)式中:PA,PBA,B两测点上两台仪器的同时读数值,Pa;两台仪器的基准及变档差值校正,Pa; hZ 同上; hV两测点A,B间的动压差,Pa; (2.16)同上; vA , vBA,B两测点断面上的平均风速,m/s。主测路线上的矿井通风总阻力为: h阻测 =h阻AB (2.17)h
5、阻测矿井通风总阻力,Pa。2.3.6巷道风阻值计算巷道风阻值由下式计算 (2.18)RAB巷道实测风阻值,NS2/m8; hAB实测巷道AB段的通风阻力,Pa; QAB通过巷道的平均风量,m3/s。2.3.7巷道摩擦阻力系数计算对于实测巷道的摩擦阻力系数由下式计算 (2.19)实测巷道的摩擦阻力系数,NS2/m4;R同上;S实测巷道的断面积,m2;L实测巷道的长度,m;U实测巷道断面的周长,m。同时为便于与同类巷道相互比较,以及为计算或设计后期通风系统,需要将实测的换算为标准状态下的值,其换算公式如下所示: (2.20)标标准状态下(=1.2 kg/m3)巷道的摩擦阻力系数,NS2/m4;实测
6、巷道的空气密度,kg/m3; h阻AB主测路线上各段间的通风阻力,Pa。第二部分 原始数据记录与测算1、测点断面尺寸测算表测点断面形状支护形式宽度B(m)高度H(m)面积(m2)周长U(m)2半圆拱U钢喷3.502.808.4511.1622.602.555.899.323U钢6.429.7342.652.255.198.7543.402.457.0610.202.502.004.317.973.257.4510.4856.009.4153.159.6811.95212.305.068.6418183.006.36153.102.707.3110.38156.769.9886.519.8086
7、.149.5192.104.728.34114.247.91122.756.049.44172.354.337.99164.097.772、精密气压计测压数据表时间A仪器93#B仪器16#C仪器20#读数备注2009.11. P绝=100580Pa12:301-10+3000档-94024653000-3000档-4660550454对表55561113:163317488510202234238654625292468485361667711715856-35214:001767-780-7400518514-10751018021-4301519218-4998-1226-1193-133
8、6-1224559787-3000档0档-132979815:-370780-332-39311-527-37835-5571219860+3000档-53216:45195513-9231750Pa水柱计3、空气密度测算表原始记录t()(%)Psat(Pa)(kg/m3)备 注td ()tw ()P(Pa)2.2-1.21005803.449.40017161.2709副井口7.47.21071920.297.356910291.32659.48.41071221.087.462611801.31619.28.61067450.692.318311641.31219.08.810628497
9、.467111481.307213.012.21058780.891.109314971.282817.416.610622492.13919881.265418.718.01061430.793.357821561.258017.616.810530492.306720121.253417.21043190.496.14141.241310302696.15851.225810286296.16061.223817.810237596.263220371.217015.314.8994920.594.93717371.1942-1.41005902.461.38626571.2764风井地面
10、8.98.110717989.755811401.31914、风速风量测算表表速(m/min)V真K风速V实(m/s)风量Q(m3/s)V1V2V3V均(m/s)1621691672.660.95272.5321.431721651682.690.932014.743853803773816.020.93775.6536.250.310.84590.261.34800皮带6162601.020.94330.963373453363395.380.81454.3818.881011021.650.94631.5611.6252540.910.86670.794.71皮带,测风站44430.730
11、.95870.706.812602722684.260.92103.9219.860.370.352272292332303.660.89273.2720.77600风筒6963671.100.94531.047.630.610.94080.583.903603433485.520.93865.1833.713203103193165.020.93484.6928.785075205005098.030.91527.3534.6872071071711.290.81139.1638.835035125050.83456.6540.20堆积物:1*0.6340.590.90760.542.334
12、20.750.90230.682.775、矿井各段位压与自然风压测算表测定段A-BZA(m)ZB高 差AB位压差hZ(Pa)1-2405.000-118.000523.06663.161.29872-3-119.3681.417.731.32133-4-93.511-25.9-333.331.31414-6-65.125-28.4-364.701.30976-7-38.700-26.4-335.701.29507-21-82.91244.2552.621.274121-18-84.2421.316.461.261718-8-27.355-56.9-700.771.25578-941.250-68.6-839.481.24739-10108.000-66.8-807.731.233510-11106.0002.024.031.224811-12117.800-11.8-141.271.220412-13357.200-239.4-2831.361.205613-1-47.8-579.251.2353340.406、测点速压测算表VA(ms)VB速压差hv(Pa)0.00-4.2-16.80.02.61.62
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